package com.ambow.gateway.controller;

import javax.imageio.ImageIO;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.Random;

/**
 * @author 周志伟
 * @projectname 项目名称: ${project_name}
 * @classname: IdentifyingCode
 * @description:
 * @date 2018/6/8：14:18
 */
public class IdentifyingCode {
    private Random random = new Random();
    private String randString = "0123456789";// 随机产生数字
    private String randFH="+x";
    private String code = null;


    private int width = 150;// 图片宽
    private int height = 56;// 图片高
    private int lineSize = 40;// 干扰线数量
    private int stringNum = 1;// 随机产生字符数量

    /*
     * 获得字体
     */
    private Font getFont() {
        return new Font("Fixedsys", Font.CENTER_BASELINE, 50);
    }

    /*
     * 获得颜色
     */
    private Color getRandColor(int fc, int bc) {
        if (fc > 255)
            fc = 255;
        if (bc > 255)
            bc = 255;
        int r = fc + random.nextInt(bc - fc - 16);//110+7
        int g = fc + random.nextInt(bc - fc - 14);//110+9
        int b = fc + random.nextInt(bc - fc - 18);//110+5
        return new Color(r, g, b);
    }

    /**
     * 生成随机图片
     */
    public String getRandcode(HttpServletRequest request,
                            HttpServletResponse response) {
        // BufferedImage类是具有缓冲区的Image类,Image类是用于描述图像信息的类
        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_BGR);
        Graphics g = image.getGraphics();// 产生Image对象的Graphics对象,改对象可以在图像上进行各种绘制操作
        g.fillRect(0, 0, width, height);
        g.setFont(new Font("Times New Roman", Font.ROMAN_BASELINE, 36));
        g.setColor(getRandColor(110, 133));
        // 绘制干扰线
        for (int i = 0; i <= lineSize; i++) {
            drowLine(g);
        }
        // 绘制随机字符
        String randomString = "";
        for (int i = 1; i <= stringNum; i++) {
            randomString = drowString(g, randomString, i);
        }
        char [] stringArr = randomString.toCharArray();
        if(stringArr[1]=='+'){
            randomString=String.valueOf(Integer.parseInt(String.valueOf(stringArr[0]))+Integer.parseInt(String.valueOf(stringArr[2])));
        }else if(stringArr[1]=='-'){
            randomString=String.valueOf(Integer.parseInt(String.valueOf(stringArr[0]))-Integer.parseInt(String.valueOf(stringArr[2])));
        }else if(stringArr[1]=='x'){
            randomString=String.valueOf(Integer.parseInt(String.valueOf(stringArr[0]))*Integer.parseInt(String.valueOf(stringArr[2])));
        }
        g.dispose();
        try {
            ImageIO.write(image, "JPEG", response.getOutputStream());// 将内存中的图片通过流动形式输出到客户端
        } catch (Exception e) {
            e.printStackTrace();
        }

        return randomString;
    }


    private String drowString(Graphics g, String randomString, int i) {
        g.setFont(getFont());

        g.setColor(new Color(random.nextInt(101), random.nextInt(111), random
                .nextInt(121)));
        String rand1 = String.valueOf(getRandomString(random.nextInt(randString
                .length())));
        String rand2 = String.valueOf(getRandomString(random.nextInt(randString
                .length())));
        String rand3 = String.valueOf(getRandomStringFH(random.nextInt(randFH
                .length())));
        randomString += rand1+rand3+rand2+"=?";
        g.translate(random.nextInt(2), random.nextInt(2));
        g.drawString(randomString, 7 * i, 44);
        return randomString;
    }

    /*
     * 绘制干扰线
     */
    private void drowLine(Graphics g) {
        int x = random.nextInt(width);
        int y = random.nextInt(height);
        int xl = random.nextInt(13);
        int yl = random.nextInt(15);
        g.drawLine(x, y, x + xl, y + yl);
    }

    /*
     * 获取随机的字符
     */
    public String getRandomString(int num) {
        return String.valueOf(randString.charAt(num));
    }
    /*
     * 获取随机的运算符号
     */
    public String getRandomStringFH(int num) {
        return String.valueOf(randFH.charAt(num));
    }

    public String getCode() {
        return code;
    }

    public void setCode(String code) {
        this.code = code;
    }
}
